Alltournative. Offering eco-friendly adventures for travelers of all ages and fitness levels, Alltournative will have you feeling like Indiana Jones in no time. You can kayak through a lagoon, snorkel in a cenote, or zip-line above a lush jungle. The company also organizes visits to Mayan communities on expeditions to Cobá. Carretera 307, Km 287, near Playacar, Playa del Carmen, Quintana Roo, 77710. 984/803–9999 or 877/437–4990. From M$935.

Hilario Hiler. For customized tours of Mayan villages, ruins, and the jungle, contact Hilario Hiler. He is fluent in Spanish, Mayan, and English. La Jolla, Casa Nai Na, 3rd fl., Akumal, Quintana Roo, 77710. 984/875–9066. .

Maya Sites Travel Services. This outfit uses archaeologists and other experts to lead inexpensive tours of ancient Mayan sites. 505/255–2279 or 877/620–8715.